Volume problem with soundcore space A40

Hey there, I have soundcore space A40 buds and I have an issue. I buyed an Spotify premium and when I listen to some music my buds will just randomly start to change volume when I’m listening. This only happens to me when I’m using specifically this buds on Spotify. Spotify works completely fine with my other headphones and the buds work as well with other music streaming platforms. I would like to know how to fix this. Thank you.